Apparatus for making sheet glass



Oct. 13, 1931. R,.c. CONN PARATUS FOR MAKING SHEET GLASS Filed May' 27, v1930 y Y tudinal 44.75 of clay imm-ersed in the glassfbath beneath Patented ct; 1931 I UNITED-STATES,

" noY 0.1coNN, oF CLARKSBURG, wEsT vIne GLAss COMPANY, A coRPoRATiNbF PTESYLVANIA' APPARATUS Pon MAKING SHEET `eLAss A'ppnation' 'ined 1` May "27.

y which shows a horizontal section ofthe marginal portiony of the sheet. This thinning of the sheet tends to increase breakage,- and re-V v f f quires that afwider margin of the edge shall C vble-trimmed. off thanwould'otherwise be the case. The present inventionisdesigned tov Y remedy this condition, andinvolve's amodiiication of the'Slinglu'f edge holder. One embodiment ofthe invention is illustrated in the accompanying drawings,l wherein.: Y i

Figure'l isa'vertical section through the y apparatus. Figs. 2.a.nd 3 are detailsnof the edge -holdingdevicm F ig; 2 beingfa plan viewy land Figs?) being a sectionon the. line IIIIII of'Fig. 2. ,And Fig; 4 is an eni v2b larged horizontalk section throughthe edge of.

p a sheet .produced on the Slingluif machine the pres'entinvention relates.

Referring .to theV drawings, 1 is a drawlng not ein lo infr the im rovementy to which p y b p t .what the heating Y 30 tank connected tothe end of a suitable melting tank;l 2 is the lower end of the casing v .of the Fourcault drawing apparatus, suchapparatus comprisingfa vseries of pairs of'rolls driven from a series of pairs of gears 3 and serving to draw the glass upward through the casing where it is annealed; 4A is a sheet lwhich is being drawn 'from the glass 'bath in the ta'nk'l; 5,' 5 are the edge hold*-V in'g devices vin thevform of metal bowls car-4 eo ried by the arms 6, 6; 7, 7 are brackets upon kwhich the arms 6, 6 'aremounted for longiy and tilting adjustment; 8, 8 fare? standards mountedfor vertical adjustment in the base members 9, 9 ;'a'nd 10 isa draw bar the line of vgeneiatlon of the sheet 4. Y All of the foregoing is old except the par- 'K ticularconstruction of thebowls 5, 5'which ljis shown in detail 'invFigs 2 and 3. These i bowls are of cast iron or castlsteel and are` in the form' of 'the I Vhave yfound that` by cutting away the bowl,

f in'vario'us forms, 'but are preferably madein lglass 1 Y'ranged to draw-a said pool comprisingr a the slot kadjacent thereto;`

1930. serial No. 456,256.

provided with the usual slotsllfitting over the edges of the glass sheet 4. In the drawingoperation, the edge of th-e glass sheet con-A tacts with the b'owlat one side of the slot 11 and this contact serves to prevent they sheet k yfrom pulling 'in and narrowing, the manner in which the bowl functions in this par-l c l I ticular being well known in the art."A Onv each side of thefslot triangular openingsf12, 0

12. 1 VVithoutthese openingsin the useof the ,i standard Slingluff edge bowl, the sheet draws thinr atthe point a, as indicated in Fig.V 4,l this'thinning occurring about three or. four linches lfrom the extremeedge of the sheet.

as indicated at 12, V12, th is javoidedjand the sheet.V thickness clear edinFig. 2. As aresult the breakage; involved in drawing the sheet is reduced some-y is thining `action what and it becomes possible to trim thesheet vnear to its edge soy that-a saving of glass is involved. The Vopenin,g',s;12,2-12 may be made the triangular form shown] .'Ihe effect of these openings is apparently to reducevsomeeffect of the bowl and cause athickening of the sheet at the zone a." The heating keffect of th-e bowl is due to the fact thatv it absorbs heat from kthe bodyv of glass beneath and reflects it back'againstthe bath beneathand against the` edge and meniscus of the sheet beingdrawn. i I/Vhat I claim is: V v l. They combination with apparatus arglass-sheet froma pool of `molten glass,"of'means for preventing an` inward movement of the edge of the sheet in shielding'bowl of metal above the surface of thepool, but close- `lyadjacent thereto, and having a slot extend-v l v `ing inward from its4 edge and fitting around 1 the edge .of the sheet, said bowl havink an openingcut through itsfwalls on each si eOf 2. The combinationV with vapparatus arranged to drawa glass sheet fromr a poolof molten-,glassyof meansfor preventing an inward movementof the `eklge `ofthe sheety in 10i) v sten To PLATE 11, the bowl `is cutaway maintains its full to itseXtreme edge, as indicattoA said `pool comprising a shielding bowl of metal above the surface of the pool, but closely adjacent thereto, and having a. slot eX- tending inward from it edge and fitting i around the edge of the sheet, said bowl havi ing an opening of triangular shape cut through its wall on each side of the slot adjacent thereto.l E

In testimony whereof, I have hereuntosubj 1'0 scribed my name this 20th day of May, 19.30.

" y j ,1%. C. CONN; 

